Line-integrated luminosities of our models are presented in [1]}, and the line-integrated extinction in Section REF . Up to now, the few known accreting low-mass objects have been observed in H \(\alpha \)  filters with a width of order of 1–2 nm ([2]}; [3]}) or with MUSE at a resolution \(\Delta \lambda \approx 0.3\)  nm [4]}, [5]}.
However, as seen in Section ,
much more powerful instruments are underway or expected soon.
For example,
with \(R\geqslant 130,000\) , the resolution of RISTRETTO
is comparable to the effective resolution of the model curves
given the native width of the spectral features
and the slight smear coming from the velocity gradient.
Therefore,
we discuss in this section the observability at high resolution of accreting planets
whose line profiles are in part shaped by the accreting gas.
